Refrigerating apparatus



T. D. MQNTEE REFRIGERATING APPARATUS Filed Dec. 29, 1939 Sept. 13, 1932.

Patented Sept. 1 3, 1932 UNITED STATES *rmcy n. MON'IEE, or lAsAY PHILi PllN-E ISLANDS REFRIGERATING APPARATUS Application filed December 29,1930. I Serial N5 505,439.

This invention relates to refrigeration and more particularly to a refrigerating apparav tus wherein a cooling medium is circulated through a coil and absorbs heat from air within a refrigerator.

One object of the invention is to provide a device of this character wherein the coil consists of an inner tube through which the cooling medium circulates and an outer tube surrounding the inner tube and containing a liquid for transmitting heat of the surrounding air to the cooling medium thereby causing the air to be quickly cooled and retain its low temperature for a long length of time.

Another object of the invention is to so form the outer tube that it will be of 'a great deal greater cross sectional area than the inner tube and thereby permit it to hold a large quantity of heat transmitting liquid.

By this arrangement a large quantity of liquid will be present which when chilled will serve to retain temperature of air at a low point for a long time and reduce operation of circulating apparatus for the heat absorbing medium to a minimum and permit a refrigerator to be economically operated.

Another object of the invention is to provide an outer coil having a large surface for contact by air in a refrigerator and'thereby. cause the air to be quickly cooled and reduce the length of time the heat absorbing fluid must be circulated during a cooling operation.

The invention is illustrated in the accompanying drawing wherein Figure 1 is a view showing the improved coil in top plan, portions thereof being broken away.

Figure 2 is a side elevation of the coil with a portion broken away. I

Figure 3 is an enlarged view showing one end of the coil partially in section and partially in elevation, and

Figure 4 is a sectional view taken along the line H of Figure 2.

The improved coil constituting the subject matter of this invention is preferably formed as shown in Figure 1 but it is to be under- 50 stood that it may have any number of convolutions desired and alsomay be a flat coil as shown or any other desired shape. The inner tube 1 is formed, of metal tubing which is preferably copper but may be of any metal found suitable and this tube is of small diaineter and of such length that its ends ex: tend from the coil for connection with comp'anion elements of a circulating apparatus whereby sulphur dioxide nethyl chloride, ethyle chloride or any other refrigerant desired circulated through the tube. About the inner tube is disposed an outer tube 2 having each end closed by a head 3 as shown in Figures 1 and 3 and by referring to these figures it will be seen that the outer tube has short collars or necks e at its ends through which the inner tube passes. Since the inner tube fits tightly in the necks a tight joint is formed at each end of the tube 2 and the liquid with which the outer tube is filled cannot escape. Thisliquid may be any liq- I uid having heat transmitting qualities and it will be readily understood that when the device is in use warmth will be absorbed from air in a refrigerator in which the coil is mounted and transmitted by the liquid in the outer tube to the'inner tube where it is absorbedby the fluid pumped through the same. By this arrangement the temperature of a refrigerator may be lowered to a s desired degree by this improved device. By referring to Figures 3 and tit will be seen that the outer tube is a great deal larger in cross section than the inner tube and is rectangular in cross section whereas the tube 1 35 is circular in cross section. By this arrangement the outer tube is of such capacity that a large quantity of liquid may be contained therein and warmth will not only be quickly transmitted to the fluid in the inner tube, 0 but once the liquid has become chilled it will remain at a low temperature for a long time. Therefore, intervals between active operation of the refrigerating device will be lengthened and cost of operating the device reduced to a minimum. It should also be noted that since the outer tube is rectangular in cross section it has flat faces, thereby increasing the surface area of the coil and greatly increasing the effectiveness of the coil and shortening the length of time required to reduce the temperature of air in a refrigerator to a determined point at which pumping of the fluid through the inner tube is to be automatically cut off. A filling opening 5 is formed near each end of the outer tube in theupper wall thereof and in each opening is firmly secured a gasket or reinforcing block 6 formed with an opening 7 to receive a threaded closure plug 8. Therefore, the outer tube may be easily filled and additional liquid poured into the same when necessary. By not quite filling the outer coil space is provided as shown in Figures 3 and 4 in order to prevent danger of bursting the outer coil in case the liquid in this coil expands when it is chilled.

While I have shown the preferred embodiment of my invention it is to be understood that minor changes in the size, shape and arrangement of parts may be resorted to without departing from the spirit or sacrificing any of the principles of the invention.

Having thus described the invention what is claimed is:

Refrigerating apparatus comprising a coil consisting of inner and outer tubes, the outer tube having heads closing its ends and necks projecting outwardly from the heads, the inner tube being of greater length than the outer tube and projecting through the necks carried by the heads at the ends thereof, the inner tube being of small diameter and the outer tube of appreciably greater diameter than the inner tube and oblong in cross section to provide fiat faces presenting a large area for contact by air surrounding the coil, and a fluid having heat transmitting qualities filling the outer tube and constituting means for conducting heat through the outer tube to the inner tube for absorption by a heat absorbing medium passed through the inner tube, the outer tube having filling openings formed near its ends, reinforcing blocks in said openings having threaded openings formed therein, and plugs screwed into the threaded openings to close the same.

In testimony whereof I affix my signature.

TRACY D. MONTEE. 

